2026 ICD-10-CM Diagnosis Code H40.003Preglaucoma, unspecified, bilateral

ICD-10-CM Codes›H00–H59›H40-H42›H40

ICD-10-CM H40.003
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H40.003 is a billable ICD-10-CM diagnosis code for preglaucoma, unspecified, bilateral. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Glaucoma.

Code Identity

ICD-10-CM Code
H40.003
Billable Status
Yes — Valid for Submission
Code Describes
Preglaucoma, unspecified, bilateral
Short Description
Preglaucoma, unspecified, bilateral
Same as the full description in the CMS dataset.
Parent Code
H40.00
Preglaucoma, unspecified

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH40-H42Glaucoma
CategoryH40Glaucoma
This CodeH40.003Preglaucoma, unspecified, bilateral

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Angle closure glaucoma suspect
  • Angle closure glaucoma suspect of bilateral eyes
  • Angle closure glaucoma suspect of left eye
  • Angle closure glaucoma suspect of right eye
  • Bilateral glaucoma suspect
  • Glaucoma suspect caused by corticosteroid
  • Glaucoma suspect of bilateral eyes caused by corticosteroid
  • Glaucoma suspect of left eye
  • Glaucoma suspect of left eye caused by corticosteroid
  • Glaucoma suspect of right eye
  • Glaucoma suspect of right eye caused by corticosteroid
  • Open angle glaucoma suspect
  • Open angle glaucoma suspect of bilateral eyes
  • Open angle glaucoma suspect of left eye
  • Open angle glaucoma suspect of right eye
  • Suspected bilateral glaucoma
  • Suspected glaucoma of left eye
  • Suspected glaucoma of right eye

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE003
Glaucoma
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Glaucoma

Glaucoma is a group of diseases that can damage the optic nerve of one, or both, of your eyes. This can result in vision loss. There are different types of glaucoma, but the most common type is open-angle glaucoma. Other less common types include angle-closure glaucoma, and congenital glaucoma.

The full article covers:

  • What is glaucoma?
  • What causes glaucoma?
  • What are the symptoms of glaucoma?
  • How is glaucoma diagnosed?
  • What are the treatments for glaucoma?
  • Can glaucoma be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H40.003 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
365.00 Preglaucoma NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H40.003Overview

Is H40.003 (Preglaucoma, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report preglaucoma, unspecified, bilateral on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H40.003 group to?

When preglaucoma, unspecified, bilateral is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H40.003?

Under the General Equivalence Mappings, preglaucoma, unspecified, bilateral converts to ICD-9-CM 365.00 (preglaucoma NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.